Improve/json errors

crates/quarto-markdown-pandoc/src/main.rs

@@ -89,8 +89,17 @@ fn main() {
     }
 
     if !input.ends_with("\n") {
-        eprintln!("(Warning) Adding missing newline to end of input.");
-        //
+        if args.json_errors {
+            // Output as JSON to stderr
+            let warning_json = serde_json::json!({
+                "title": "Warning",
+                "message": "Adding missing newline to end of input"
+            });
+            eprintln!("{}", warning_json);
+        } else {
+            // Output as plain text to stderr
+            eprintln!("(Warning) Adding missing newline to end of input.");
+        }
         input.push('\n'); // ensure the input ends with a newline
     }
 

crates/quarto-markdown-pandoc/src/readers/qmd.rs

@@ -16,7 +16,7 @@ use crate::pandoc::{self, Block, Meta};
 use crate::pandoc::{MetaValue, rawblock_to_meta};
 use crate::readers::qmd_error_messages::{produce_error_message, produce_error_message_json};
 use crate::traversals;
-use crate::utils::error_collector::{JsonErrorCollector, TextErrorCollector};
+use crate::utils::error_collector::{ErrorCollector, JsonErrorCollector, TextErrorCollector};
 use std::io::Write;
 use tree_sitter::LogType;
 use tree_sitter_qmd::MarkdownParser;
@@ -140,26 +140,43 @@ where
     let context = ASTContext::with_filename(filename.to_string());
 
     // Create appropriate error collector based on whether JSON errors are requested
+    // and collect warnings after conversion
     let mut result = if error_formatter.is_some() {
         // JSON error format requested
         let mut error_collector = JsonErrorCollector::new();
-        pandoc::treesitter_to_pandoc(
+        let pandoc_result = pandoc::treesitter_to_pandoc(
             &mut output_stream,
             &tree,
             &input_bytes,
             &context,
             &mut error_collector,
-        )?
+        )?;
+
+        // Output warnings to stderr as JSON
+        let warnings = error_collector.messages();
+        for warning in warnings {
+            eprintln!("{}", warning);
+        }
+
+        pandoc_result
     } else {
         // Text error format (default)
         let mut error_collector = TextErrorCollector::new();
-        pandoc::treesitter_to_pandoc(
+        let pandoc_result = pandoc::treesitter_to_pandoc(
             &mut output_stream,
             &tree,
             &input_bytes,
             &context,
             &mut error_collector,
-        )?
+        )?;
+
+        // Output warnings to stderr as formatted text
+        let warnings = error_collector.messages();
+        for warning in warnings {
+            eprintln!("{}", warning);
+        }
+
+        pandoc_result
     };
     let mut meta_from_parses = Meta::default();
 

crates/quarto-markdown-pandoc/tests/test_json_errors.rs

@@ -158,3 +158,24 @@ fn test_label_range_note_type() {
         "Should find at least one label-range note in the error"
     );
 }
+
+#[test]
+fn test_missing_newline_warning_json_format() {
+    // This test verifies that the missing newline warning is formatted as JSON
+    // when --json-errors is used. Currently this test will fail because the
+    // warning is always output as plain text.
+
+    // Create input without trailing newline
+    let input = "# Hello World";
+
+    // We can't easily test the binary's stderr output from here, but we can
+    // document the expected behavior: when --json-errors is used, the warning
+    // should be output as:
+    // {"title":"Warning","message":"Adding missing newline to end of input"}
+    //
+    // Currently it outputs:
+    // (Warning) Adding missing newline to end of input.
+
+    // This test just documents the issue. The actual fix will be in main.rs
+    // where the warning is emitted.
+}

crates/quarto-markdown-pandoc/tests/test_warnings.rs

@@ -0,0 +1,68 @@
+use quarto_markdown_pandoc::readers;
+use quarto_markdown_pandoc::utils;
+
+#[test]
+fn test_caption_without_table_warning() {
+    // Create input with a caption after a div (not a table)
+    // This should parse successfully but emit a warning
+    let input = r#"::: {.my-div}
+Some content
+:::
+
+: This caption has no table
+"#;
+
+    // Parse the document
+    let result = readers::qmd::read(
+        input.as_bytes(),
+        false,
+        "test.md",
+        &mut std::io::sink(),
+        None::<
+            fn(&[u8], &utils::tree_sitter_log_observer::TreeSitterLogObserver, &str) -> Vec<String>,
+        >,
+    );
+
+    // Parsing should succeed (warnings are not errors)
+    assert!(result.is_ok(), "Document should parse successfully despite warning");
+
+    // TODO: Once the fix is implemented, we need to verify that the warning
+    // "Caption found without a preceding table" was actually output.
+    // For now, this test just verifies that parsing succeeds.
+    // After the fix, we'll need to capture stderr or modify the API
+    // to return warnings alongside the successful parse result.
+}
+
+#[test]
+fn test_caption_with_table_no_warning() {
+    // Create input with a proper table caption
+    // This should parse successfully with no warnings
+    let input = r#"| A | B |
+|---|---|
+| 1 | 2 |
+
+: Table caption
+"#;
+
+    // Parse the document
+    let result = readers::qmd::read(
+        input.as_bytes(),
+        false,
+        "test.md",
+        &mut std::io::sink(),
+        None::<
+            fn(&[u8], &utils::tree_sitter_log_observer::TreeSitterLogObserver, &str) -> Vec<String>,
+        >,
+    );
+
+    // Parsing should succeed and no warnings should be emitted
+    assert!(result.is_ok(), "Document with valid table caption should parse successfully");
+
+    let (pandoc, _context) = result.unwrap();
+
+    // Verify we have a table in the output
+    assert!(
+        pandoc.blocks.iter().any(|b| matches!(b, quarto_markdown_pandoc::pandoc::Block::Table(_))),
+        "Should have a table in the output"
+    );
+}